We all have our complaints about study materials and documentation. I came upon the following error in Cisco documentation while doing some simple RIP and RIPv2 labs, which in turn were based upon ideas attained while reading Soltie's and Raza's books.
The idea is to use the distance command to change the admin distance of certain routes. This is a protocol independent command, but since I am looking at RIP... In any case, in looking over the following from CCO ---------------------------------------- Example In the following example, the router igrp global configuration command sets up IGRP routing in autonomous system number 109. The network router configuration commands specify IGRP routing on networks 192.31.7.0 and 128.88.0.0. The first distance router configuration command sets the default administrative distance to 255, which instructs the Cisco IOS software to ignore all routing updates from routers for which an explicit distance has not been set. The second distance command sets the administrative distance for all routers on the Class C network 192.31.7.0 to 90. The third distance command sets the administrative distance for the router with the address 128.88.1.3 to 120. router igrp 109 network 192.31.7.0 network 128.88.0.0 distance 255 distance 90 192.31.7.0 0.0.0.255 distance 120 128.88.1.3 0.0.0.0 Note In this example, the distance command specifies an administrative distance of 255 for networks 192.31.7.0 and 128.88.0.0. The second distance command specifies an administrative distance of 90 for network 192.31.7.0. The third distance command specifies an administrative distance of 120 for network 128.88.0.0. In the following example, the set distance is from the least to the most specific network. router igrp 100 network 10.0.0.0 distance 22 10.0.0.0 distance 33 10.11.0.0 0.0.255.255 distance 44 10.11.12.0 0.0.0.255 Note In this example, adding distance 255 to the end of the list would override the distance values for all networks within the range specified in the example. The result is that the distance values are set to 255. ---------------------------------------------------- end of CCO excerpt I discovered that this last section is incorrect. It does not work. Plain and simple it is wrong. I got to wondering about that. How did it get in here? Didn't anyone check? Was this something Cisco intended to do, but just never got around to including the code? Not that I should be wasting my time like this, but I researched the command history through various IOS documentation releases on the doc CD. what I found is that beginning with IOS release 11.3 this error entered the documentation. It has remained there since. Prior to 11.3 this last section, referring to using the distance command in conjunction with networks, did not exist. the command, of course, refers to routers on networks - kinda like the OSPF network command refers to interfaces within certain subnets ranges. you cannot enter the command distance x 10.0.0.0 you get an error. It just strikes me as odd that this error continues to be propagated through several years of documentation. No wonder so many of the study materials contain so many errors, with this kind of source material. Just griping. Chuck Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=46139&t=46139 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
